A total of three rectangular fabric expansion joints and six round fabric expansion joints were custom designed for an offshore oil extraction and natural gas project. The rectangular joints are 56″ x 81″ I.D. x 25″ O.A.L. and the round joints are 105″ dia. x 24″ O.A.L. 309 stainless steel was used for the duct, 310 for the liners, 316 for the covers, 321 for the studs, 309 for the flanges. The fabric belt was a three layer belt with an inner layer of glass cloth, a layer of KO wool and an outside layer of reinforced PTFE. The expansion joints were designed for 1 psig at a temperature of 1100°F. The rectangular joints were designed for 2″ axial compression, a 1″ extension, and a 1″ lateral offset. The round joints were designed for 4″ axial compression, a 1″ extension, and a 0.5″ lateral offset. All welds were dye penetrant examined.
Fabric Expansion Joints > Blog Articles
U.S. Bellows 101: Expansion Joint Basics Webinar
This Webinar is over… to view the recording, go to http://www.usbellows.com/news/webinar_index.html
* Live Webinars are approved for 1 PDH credit for TX P.E.’s
This presentation will briefly touch on the basics of fabric expansion joints; however, is mainly focused on the various designs, material details, and applications. Learn how fabric expansion joints are engineered and fabricated for various applications and the many factors that influence those designs. View the abundance of materials used, including Fluoroplastic and Fluoroelastomer, and their respective capabilities. Take a journey through a Fossil Fired Power Plant and see exactly where fabric expansion joints are required.
U.S. Bellows, Inc., a division of PT&P, has more than 50 years of experience designing and manufacturing expansion joints, along with replacement and repair services.
The two assemblies shown, a mitered elbow duct work and fabric expansion joint and duct work assembly, are designed for a sulfuric acid plant. Both assemblies are fabricated from 1/4" thick 304L stainless steel. They are designed for a 15" water column with a temperature of 180°F, axial compression of 3/4", and lateral movement of 3/4". A dye penetrant examination is performed on all welds prior to shipment.
Are there fabric expansion joints in your future? Are you looking to design or purchase a fabric expansion joint or just curious about the assortment of available frames? View different types of metal attachment styles for fabric expansion joint designs.
Metal Attachment Frames with Baffles and Insulation Pillows
We recently added new diagrams to the U.S. Bellows website. Check out all of the different components that make up a custom fabric expansion joint versus a standard expansion joint.
Diagram of High Temperature, 3-Layer Expansion Joint
Diagram of Standard Fabric Expansion Joint
This rectangular fabric expansion joint is designed for high air circulation flow for an air cooling loop duct in a power plant. It measures 81″ L x 18″ W x 16″ face-to-face, and is fabricated with stainless steel angle, frame ends and internal liner. The fabric belt material is reinforced silicone fabric cloth, which can withstand temperatures up to 550°F. This expansion joint is rated for axial movement of +/- 1″ with a 1/2″ lateral offset. A dye penetrant test on all welds was conducted prior to a quality assurance inspection prior to shipment.
This rectangular fabric expansion joint will be used in an exhaust duct in a power plant. It measures 136″ L x 54″ W x 12″ face-to-face and is fabricated with stainless steel angle, frame ends and internal liner. The fabric belt material is PTFE coated glass cloth, which is low friction and high in tear/crease resistance and tensile strength. This expansion joint is rated for an axial movement of 1-1/2″ with a lateral offset of 1/2″ and maximum temperatures up to 600°F. A quality inspection was administered, including a dye penetrant test prior to shipment.
Reasons to choose a fabric expansion joint:
- Good for high temperature applications
- High movement capabilities
- No size restraints
- Less expensive to design and fabricate
- See more reasons in our catalog
Reasons to choose a metal expansion joint
- Maintenance Free
- Withstand large range of temperatures
- Can be used for high pressure services
- See more reasons in our catalog
This neoprene fabric expansion joint is 42″ I.D. by 7-3/4″ face-to-face and is designed for a generator cooling fan in a power plant. The angle frame ends are fabricated from carbon steel, and the neoprene fabric belt is fastened to the angle flanges by two stainless steel clamps. The expansion joint absorbs vibration between the air supply duct and the cooling fan. A dye penetrant exam was performed on the welds of the angle iron flanges prior to shipping to the customer ahead of schedule.
Trying to decide which type of fabric expansion joint to use in your application? Our new comparison chart lists the materials, temperature ranges, advantages, pressure, chemical resistance and applications.
The following are examples of expansion joints fabricated from a variety of materials.
Expansion Joints Fabricated with Neoprene Material:
Expansion Joints Fabricated with Reinforced Silicone Material:
Expansion Joints Fabricated with PTFE Impregnated Fiberglass Material:
Expansion Joints Fabricated with Silica Fabric Cloth Material: